I fixed the following bugs:

• #2789 multivariate polynomials over residue fields of number fields are broken
• #1367 weird bug creating fractional ideal in relative number field

That "weird bug" was actually lots of missing conversions and questionable decisions over the years. This required a great deal of time to understand the infrastructure to fix properly, but opens the door for easy slaying of additional bugs, including...

• #4869 make element of relative number field from polynomial
• #4727 list method on relative number field elements is broken -- it doesn't satisfy the most basic consistency check

I reviewed several patches at the beginning of the conference, too. Most made it into 3.3.0alpha2.